<!DOCTYPE HTML>
<html>
    <head>
        <script src="head.min.js"></script>
        <script>
            head.load("file1.js", "file2.js");
        </script>
    </head>
    <body>
        <!-- my content-->

        <script>
            head.ready(function () {
                // some callback stuff
            });
        </script>
    </body>
</html>